DESIGN STUDY ROLL CONTROL OF SEA-SITTING AIRCRAFT.
LOCKHEED-CALIFORNIA CO BURBANK
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The feasibility of roll axis stabilization of air-sea vehicles during extended periods of sea-sitting on open ocean surfaces has been investigated for significant wave heights up to twelve feet Sea State 5. Vehicle configurations included a conventional seaplane hull and a vehicle of advanced design which utilizes a tandem spar-buoy flotation system. While previous studies and tests have shown the feasibility of fitting aircraft with vertical floats to improve sea-sitting habitability, this study explored the use of active control systems rather than passive devices for this purpose. It is assumed that an air-sea vehicle, while sea-sitting, can be roll stabilized if roll torques are generated by active force producing devices located near the wing tips which oppose disturbance torques acting on the basic flotation system due to its presence in the sea. Preliminary designs for control systems based on differential buoyancy and reaction thrust are delineated and compared. Author
- Fluid Mechanics